Watkins Glen International is proud to announce another full lineup of sportscar racing action for Sahlen’s Six Hours of The Glen. The TUDOR United SportsCar Championship and Continental Tire SportsCar Challenge return in 2015 and are joined by Lamborghini Super Trofeo, Porsche GT3 Cup USA and Cooper Tires Prototype Lites for an action-packed Sahlen’s Six Hours of The Glen (June 25-28).